export default {
    addCart(context,payload){
        return new Promise((resolve,reject) => {
            // payload新添加的商品
            // let oldProduct = null
            // for(let item of state.cartList){
            //     if(item.iid == payload.iid){
            //         oldProduct = item
            //     }
            // }
            //1.查找之前数组中是否有该商品
            let oldProduct = context.state.cartList.find(item => item.iid === payload.iid)

            //2.判断oldProduct
            if(oldProduct){ //数量+1
                // oldProduct.count += 1
                context.commit('addCounter',oldProduct)
                resolve('当前商品数量 + 1')
            }else{
                payload.count = 1 //添加新的商品
                // context.state.cartList.push(payload)
                context.commit('addToCart',payload)
                resolve('添加了新的商品')
            } 
        })
    }
}